glacial striations on basalt columns - devil's postpile (california)

glacial striations on basalt columns - devil's postpile (california), columnar basalt, devil's postpile, eastern sierra, erosion, forest, geology, glacial polish, lava, lava flow, rock formation, trees, volcanic

The top of the columns of Devil's Postpile - Columnar Basalt in the Eastern Sierra (California)

A basalt volcanic flow formed hexagonal-shaped columns when it cooled down.­

You can clearly see the parallel grooves showing the erosion caused by debris pushed by the slow-moving ice of the glacier that used to cover this valley.­ Those marks are called glacial striations.­

For more info about this rock formation, go to en.­wikipedia.­org/­wiki/­Devils_­Postpile_­National_­Monument.

More images of ▶ basalt california columnar basalt columns devil's postpile eastern sierra erosion forest geology glacial polish glacial striations lava lava flow rock formation trees volcanic
Volcanic Areas of the Pacific North-West Eastern Sierra (California)
Inyo National Forest, Pacific Crest Trail, California, USA